Liquid storage tanks play a significant role in storing hazardous liquids in process industries. Hence, their proper seismic performance is considerably important to prevent the catastrophic consequences of tank failure. This study focuses on seismic safety assessment of oil storage tanks. To this end, four unanchored tanks of various height-to-diameter ratios (H/D) were considered and their elastic and inelastic buckling failures were studied, as well as their uplifting behaviour. To this end, incremental dynamic analysis was employed in an Abaqus platform using the lateral seismic excitations. Different patterns of random geometric imperfections of various amplitudes were considered in the tank models. The Budiansky–Roth procedure was followed to calculate the buckling capacities of tank shells. The results of this study revealed that the imperfection has a small but notable effect on buckling capacity of tank shells, but its effect on tank uplift is negligible.

中文翻译：

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不完美无锚罐的抗震性能

液体储罐在加工工业中储存危险液体方面发挥着重要作用。因此，它们适当的抗震性能对于防止储罐故障的灾难性后果非常重要。本研究的重点是储油罐的抗震安全评估。为此，四个不同高径比（H / D) 被考虑并研究了它们的弹性和非弹性屈曲失效，以及它们的提升行为。为此，在使用横向地震激励的 Abaqus 平台中采用增量动态分析。在储罐模型中考虑了不同幅度的随机几何缺陷的不同模式。采用 Budiansky-Roth 程序计算罐壳的屈曲能力。这项研究的结果表明，该缺陷对罐壳的屈曲能力影响很小但很显着，但其对罐顶升的影响可以忽略不计。